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There is a mass on the load arm that is subjected to a force \(F_2\). This can be, for example, the gravitational force that pulls the mass to the ground. To lift the mass on the seesaw, we must act on the force arm with a force \(F_1\). The longer the force arm, the smaller this force \(F_1\) must be. This means that it is easier to lift a mass with a longer force arm. This is the law of leverage. As a formula, we can write it as follows:$$ F_1 \, l_1 ~=~ F_2 \, l_2 $$